Hi, I started to experiment with the casefold feature of ext4 and some other filesystems. I was hoping to get some significant performance gains for Samba server with large directories. It turns out though that the case insensitive feature is not usable because it does not match the case mapping tables that other operating systems use. More specifically, the german letter "ß" is treated as a case equivanten of "ss". There is an equivalent of "ß" and "ss in some other scopes, also AD LDAP treats them as an equivante. For systems that requires "lossless" case conversion however should not treat ß and ss as equivalent. This is also why a filesystem should never ever do that Since 2017 there is a well-defined uppercase version of the codepoint (U+00DF) of the "ß" letter in Unicode: U+1E9E, this could eventually be used but I haven't seen any filesystem using that so far. This would be a possible and lossless case equivalent, but well, that's actually another thing to discuss. The important point is to _not_ use the ß/ss case equicalent. The casefold feature is mainly useless otherwise. Can this be changed without causing too much hassle? Cheers Björn
